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How to Use Data Communications
14
WATLOW Series 945
Figure 7 -
XON/XOFF "?"
Command Example.
XON/XOFF "?"
XON/XOFF "?" Command Example
You want to know the Alarm 1 Low (A1LO) value. The "?" uses a variation of the
message syntax shown just below. This protocol requires an ending carriage
return character.
"?" Command syntax with XON/XOFF Protocol:
? <space> Data.1 <CR>
Enter in ASCII:
? <space> A1LO <CR>
The hex string will be:
3F2041314C4F0D
The value of A1LO will be between rL (Range Low) and rH (Range High), say, 500.
Response from the Series 945:
<XOFF> <XON> <current value of A1LO> <CR>
The hex response string is:
13113530300D
ASCII
Characters
HEX
Value
1
41 4C31
Space
?
3F 20
A
L
CR
0D
4F
O
0
0
30
5
35 30
CR
0D
ASCII
Characters
HEX
Value
<XOFF>
13
<XON>
11